Anyone know any yaoi mangas where the seme has a strong sexual desire for the uke once he had first "contact" with him? (or possibly the uke towards the seme) Like, a hungry beast or something (Sorry this sounds so erotic )

Some examples I have come across are like Ryouma towards Izumi in Love Stage!! and Morinaga and Tatsumi in Koisuru Boukun.

Thanks in advance, guys!

well there is this series from FUJISAKI Kou and I think in Oboreru Kemono no Koibito it's the most extreme of them all..but the whole series is not that bad (and all parts of the series somewhat fit your request)

A lot of the stuff by Kano Shiuko.

Is supernatural/fantasy genre ok?

Because the first thing that came to mind was Wild Wind - it's a really great story. Not sure how strongly it fits with your requirements but it popped right into my head so it's fate (unless you've read it already)

Also there's Akuma no Himitsu - has an incubus in it, but he doesn't know he's an incubus at first so just finds himself uncontrollably attracted to the other lead.

In Leopard Hakusho, according to the description( there are only a few chapters uploaded on different sites), in chapter 7, viewers are left with a cliffhanger as it ends with the seme student 19 year old Rinku raping his 27 year old professor , the mild mannered but snarky Yakushiji. Yakushiji is gay, but his married older lover breaks up with him. Lusty Rinku is so bold he rapes him on the rooftop of the university. Poor Professor, he really looks traumatized at being violated. Ironically, Rinku states that raping the instructor ended his sexual problems, he had problems becoming aroused with his female lovers and getting bored with sex. Go figure. According to this site , the rape also causes the Professor to become a sex maniac and bed Rinku on a constant basis. In Black Sun, uke Leonard and seme Jamal hump like crazy too.

have you tried reading Mujihi na Otoko?
it really is an amazing yaoi manga and the seme starts to develop those kinds of
"Uncontrollable desires" in the sequel Mujihi na Anata

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